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Finding the Fourth Proportional to 681.99, 939.22 and 620.49

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Solution

The fourth proportional to 681.99, 939.22 and 620.49 is: 854.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.99 : 939.22 = 620.49 : x
  2. Step 2: Convert to fraction form
    681.99/939.22 = 620.49/x
  3. Step 3: Cross multiply
    681.99x = 939.22 × 620.49
  4. Step 4: Simplify right side
    681.99x = 582,772.41
  5. Step 5: Solve for x
    x = 582,772.41/681.99
  6. Step 6: Final answer
    x = 854.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.